Brake-shoe.



W. H. MCDONOUGH.

BRAKE SHDE.

APPucATloN r|LEo'APR.25,19ss.

Pawn June 5, 1917.

unir ern ,arr rien.

WILLIAM E. MODONOUGH, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE AMERICAN BRAKE SHOE AND; FOUNDRY COMPANY, OF WILMINGTON, DELA- WARE, A CORPORATION OF DELAWARE.

n BRAKE-SHOE.

raaaeee.

Specification of Letters Patent.

Patented J une 5, 31917.

Application filed April 25, 1916. Serial No. 93,363.

To all whom t may concern.'

Be it known that I, WILLIAM H. MODON- O'UGH, a citizen of the United States, residing at New York, in the county and State of N ew York, have made a certain new and useful Invention in Brake-Shoes, of which the following is a specication.

This invention relates to brake shoes.

The object of the invention is to provide a brake shoe which is strong and durable, and which is economical to manufacture.

Further objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, location, combination and relative arrangement of parts, all as will be more Vfully hereinafter set forth, as shown i in the accompanying drawing, and iinally pointed out in the appended claims.

Referring to the drawing Figure 1 is a plan view of a brake back ing plate embodying my invention.

Fig. 2 is a broken sectional view of the same, taken on the line 4L, 4, Fig. l, and looling in the direction of the arrows.

Fig. 3 is a broken view in plan showing a modied form of lug and embodying my invention.

Fig. 4 is a sectional view of the same taken on the line 6, 6, Fig. 3, and looking in the direction of the arrows.

Fig. 5 is a plan view of a still further modified form of lug employed in accordance with my invention.

rlhe same part is designated by the same reference numeral wherever it occurs throughout the several views.

It is the common practice in the manufacture of brake shoes to employ a reinforcing sheet of steel or other ductile metal to the back of a shoe body and to secure the two together in a convenient manner, the metal reinforcing sheet being provided or formed with a key lug to secure the shoe to the brake head.. It is a common expedient to produce the key lug by slitting the sheet metal back and punching o-r pressing out the slit portions. The obvious objection to this method is that the greatest strain upon the sheet metal back is at the point of the lug thereon. Therefore, when the lug is formed by slitting or cutting away the metal back at that point, the metal back is considerably weakened. It is also a common expedient to bend, crimp or twist the sheet metal back to form the hey lug. rJhe same objection hereinbefore noted applies equally well to this arrangement as it is obvious that bending or crimping or twisting the sheet metal back greatly decreases the strength thereof at the point where the lug is formed, which, as hereinbefore stated, is the point of greatest strain upon the backing.

It is also a common expedient to make llugs separate from the backing, and to secure the lug and backing to each other by the cast metal forming the shoe. It is obvious that this arrangement necessitates a cast metal reinforcement for the lug, which is objectionable because the cast metal is not sufiiciently strong for this purpose.

It is among the special purposes of my invention to overcome the objections above noted, and to provide a shoe structure in which the shoe body is cast onto a sheet metal backing plate, the latter being perforated or formed with openings in the usual manner. I also propose to provide key lugs separate from the backing plate and to eiiiciently secure the key lugs to the backing plate in any well known manner, such as by welding it thereto, thereby eliminating twisting, crimping or binding the backing plate to form the lug, or cutting or slitting the backing plate and thereby weakening it.

In the drawing 10 designates the sheet metal reinforcing plate or backing to be applied to the shoe body. The plate 10 is perforated or provided with openings therethrough, as indicated at l2, and is usually curved to conform to the shape of the shoe body, and is placed in the mold into which the metal to form the shoe body is poured, whereby such metal, when poured, not only forms the shoe body, but also Hushes through the openings or perforations 12 of the backing or reinforcing plate, thereby eliiciently attaching the plate and the shoebody to.

gether. It is obvious that the openings or perforations l2 may be of any desired number, size or shape.

As above explained, I provide a key lug designated at 13, which I secure to the backing plate by welding it thereto. The key lug may be formed in any desired manner.

In Figs. l and 2, I show a form of lug, wherein the lips 15 are outwardly flanged to 7 VWerefnot flush ywith the surface of the bachy i kf (rest uponthe hacking plate l0, as shown",y and 'are then Welded thereto. f f' p It isdesirahle toheve the outer siirface of pressions hammered or pressed lin the beek# ying idas shown. The'lips 16 and 17,` are r` Welded' to the backing as hereinhefore ydescribed. lnfvthis' arrangement, it will he yseei'ithatat the point of the lug on the back;

ring,y the hacking is materially reinforced by the separitelug due tothe full thickness of i thebaclringplate .between the lug sides and at the saine time ohviating the necessity of building up onr the end of' the brake heed which would be necessary if the lug lips ing plate...

In Fig. 5 I show a modified forni of lug lip 18 which is Weldedv to the hacking plate,

yend which may 'he either seated in a def pression in the backing plate and welded i Cop-ieslof this patent may be obtained for Fig, e.

thereto, 'or seated en the surface of the backing plate and Welded thereto as shown in l have yfoundfthat' bythe arrangements of lugs and ythe reinforcing hacking plates Vtofsaid backg I my hand on this herein described,ik it isk possible to greatly y*strengthen the'hrake shoesg and the cost oi' maintenance is considerably diminished. 7

hile have shown yand described specilick` structures enibodyingmy invention,1 Wish it to be understoody thet many other forms andarrangeinents Will'readily occurk to those Y skilledin the artwthoiit departing from the broad sco 3e of in i invention. Therefore What'I claim as new and useful7 and of my n own invention end desire to secure loyLet-y sters Pstentisf f l. In a brake shoe,

ing hack and 'a keyy lug provided with' outwardly flanged lips7 a sheet inet'al reinforc-L said lipsheing Welded K, y

" Q. ln a'brnke shoe, 'al sheetfmetal reinorcing hack providedk with depressed portions,

a hey lugprovided with outwardly flangedy lips to seat in said ydepressed portions, said lips heing'ivelded to said hack,k w i Y 3. In a. brake shoe, a reinforcing baolrprovided y*with y depressed" portionsa s keyy lug yhaving lieyivay openings in the sides thereofy and provided withy outward@7 hanged lips,

said lips seating Within the depressedportions of the said back and anchored thereto. 1n testimony whereof I have hereunto set 22nd day of Merch, A.,y D.

' f yvviLLniiii n. Men@Nomine` rive ycents eaclnby addressing-the Commissioner of IE'ate1its-k `WaSl1ng`tOn, D. Gf ik l* y y y y" y hmm" 7. 

